I want to re load 3 modules of BI apps through DAC from new data source. I have created an execution plan with all the three modules to run at a time, previously I had loaded module by module from different data source.

Now I want to do a full load from different source for all modules, below are steps I'm following

- I've over writed the physical data sources details with new source details
- I have done Reset data sources so that it will do full load in next load
- I have checked full load always for the execution plan containing all 3 modules

are the above steps are correct/sufficient?..
- do I need to create new connection for physical data sources or over write is correct
- checking full load always is recommended?

are the above steps are correct/sufficient?
-->The below answer this question
do I need to create new connection for physical data sources or over write is correct
---> Its up to you, can go for new one or modify existing one. If existing one is not at all required in future then you can go for override else go for new connection.
checking full load always is recommended?
---> If you check this every time the EP run as FULL load you wont find an Incremental one, so just uncheck that.

- If I add new physical data source with new connections, how DAC will pick new source from available two physical data source details does this create any problem/conflict
- Are any parameters need to be changed in DAC to reflect new data source..

You need change the value in the Parameters @EP and also need to add in Workflow Manager with same name as in DAC Physical sources.
Refresh dates are based on the physical connection in dac, when we set them null the dependent task run as full mode, that would take care of truncating the table, and the same when you set null for tables under the physical connection.

No. If you want to load data module by module make sure that the first module run as full load and the rest others are incremental.
In this case DAC will take care about tasks and tables, some are in full load mode and others are as incremental.
Since you have to take care of common dimensions, DAC will do this for you.

When you want to run the full load just reset warehouse and run the EP thats it.

1) Do a tns ping once again
2) Create DSN using odbcad32.exe and use same name as tns entry
3) In Workflow Manager->Connections create a connection with same name as tns/dsn and make sure the same name in DAC physical connections

I think the issue is with tns entries in tnsnames.ora file on informatica server. I need to copy the new OLTP database tns entries in to informatica server tnsnames.ora..I found this is on some forum's

But how did DAC server able to connect to OLTP with tns entries..need to investigate it....:)